fix undefined index exception

extension/Classes/Core/QuickFormQuery.php

@@ -148,6 +148,11 @@ class QuickFormQuery {
             $t3data[T3DATA_UID] = 0;
         }
 
+        if (!isset($t3data[T3DATA_HEADER])) {
+            // TODO: ?CR: when does this happen? why no exception thrown?
+            $t3data[T3DATA_HEADER] = '';
+        }
+
         // Read report file, if file keyword exists in bodytext
         $reportPathFileNameFull = ReportAsFile::parseFileKeyword($t3data[T3DATA_BODYTEXT]);
         if ($reportPathFileNameFull !== null) {